Pulling tool



Sept. 23, 1947.

A CORNWELL PULLING TOOL 2 Sheets-Sheet 1 Filed June 8, 1944 Fig.1.

TMLUTm BYK Patented Sept. 23, 1947 OFFICE IIPULLING 'rooL 7 Arthur L. Cornwell, Wells vi1le, N. r. j b 7 Application June 8, 1944, Serial No. 539,346

This invention relates to a new and improved pulling tool adapted in one form or position to remove gears, bushings, battery terminals and the like from their shafts or posts by engaging the former from the outside, and in another form or position to remove bearings and other ringlike elements by engaging them from the inside. My improved puller comprises a power screw threaded into a block and having cooeprating therewith a plurality of relatively long work engaging elements so pivotally connected to the block by rearwardly extending links that work pulling effort exerted on the tool causes the elements tightly to engage and grip the work without danger of accidental displacement. The tool can be made in' small and large sizes and with varying characteristics adaptable to varying types of work, and the simplicity of its construction renders manufacture and use of the tool very convenient and economical. The productionof an improved pulling tool of this nature comprises the primary object of the invention.

In one form of the invention the tool is particularly adapted to the pulling of battery terminals and like small elements from their posts and in this type of tool I preferably employ spring members normally operative to hold the jaws ofv the tool in vwork engaging position. My improved, puller as thus constructed is adapted convenientlyand resiliently to be snapped into place on thework and thesprings furthermore serve the function of holding the jaws in contact with the work during the preliminary functioning of the, tool.

.A; further-and important feature of the invention relates to a relatively simple arrangement whereby the jaws can be conveniently reversed to perform either inside or outside pulling operations. I am aware that reversible tools for performing these functions as well as the employment of springs for holding the jaws in contact with the work are not broadly new but the new and improved puller comprising my invention which is adapted to serve these functions with great facility is new, extremely simple, economical to manufacture and quite superior to pullers heretofore known, all for reasons hereinafter more particularly described. The production of such an improved puller of the nature and for the purposes described comprises a further object of the invention.

These and other features of the invention will be best understood and appreciated from the following description of preferred embodiments 1 Claim. (01. 29- 261) I thereof selected for purposes of illustration and shown in the accompanying drawings in which,

7 Fig. 1 i's a side elevation of a puller comprising my invention, v 1

Fig. 2 is an edge view thereof, I Fig. 3 is a view taken on line 3-3 of Fig. 1, .Fig. 4 is .a side elevation of amodified construction, V

Fig. 5 is.a like view with the parts in reversed position, and.

Fig. 6 is a view taken on line 6+6 of Fig. 4. Referring first to Figs. 1-3 of the drawing, wherein I have illustrated my invention in the form of a relatively. small puller particularly adapted to the pulling "of battery terminals and the like, I 0 indicates a power screw. threaded transversely into and through a block 12 and having a work engaging forward end I4. Thetool is illustrated as having two relatively long work engaging elements 16 and the two ends ,of the block are bifurcated to receive these elements. The elements l6 extend through the bifurcated ends of the block at opposite sides and longitudinally of the screw and have inwardly projecting work engaging jaws. I8 on their forward ends. Each such element is pivotally attached to the block by a pair of links 20 riveted at their forward ends to the block at the inner side of the element, each rivet 22 "being disposed between the element and screw, and riveted at their rearward ends to the elements at 24 rearwardly of the block. Each element is also prevented from .movement outwardly of the bifurcations by rivets 26 disposed through the block outwardly of the elements. Leaf springs 28 are also preferably provided for normally pivoting the elements in the work en-' gaging directions. Each spring has its forward end secured to the block by a screw 30 and its rearwardly directed. free end is in contact with the inner face of, the element rearwardly of the block. V

The springs 28 normally force the elements outwardly into contact with the rivets 26 and pivot the elements about the rivets in a direction moving the work engaging jaws l8 inwardly, whereby normally holding the jaws in closed position. When the operator desires to use the puller he grasps the operating end 32 of the screw with one hand and with the other hand he presses the rear ends of the elements IE inwardly whereby spreading the jaws l8 as indicated by broken lines in Fig. 1. The jaws are then moved over the work 34 and when the operator releases the elements the jaws snap into engagement with the work and are held in such position by the springs struction conveniently adaptable to both outside and inside pulling operations. prises a power screw 40 threaded transversely into and through a block 42 and having a work engaging forward end 44. work engaging elements 4'6 extend through the bifurcated ends of the block at opposite sidesand longitudinally of the screw and have work engaging jaws 48 on their forward ends. Pivotally attached to the rearend of each element by rivets 52' are a pairof links 50, the-rear ends of the links being thus pivotally attached and their forward ends being adapted'to cooperate with the block in either position of Fig. 4 or Fig. 5. The forward ends of the links-are perforated to receive bolts 54 and the block is likewise perforated at'inner' and outer positionsto receive bolts 54 an 56. The bolts 54 are relatively longer whereby to extend throughand secure the-links to the block.

,When it is desired to do outside'pulling, as illustrated'in Figs. 4 and 6, the forward ends of the links 50-are secured tov theblock at their inner positions by the long bolts 54' and the short bolts 56 are" placed inthe. outer perforations of the block. When the links are thus connected, rearward thrust of the block thereon in the pulling operationforces the elements outward against bushings 56- on thebolts 56 which serve-as pivotal abutments for the elements andc'ause the jaws 48 to move inwardly and tightly engage and hold the work' 58 without danger of displacement therefrom. Whenit is desired to do insideipulling, asillust'rated in Fig. 5; the bolts 54- and 55'are removed, the elements 46 are removed from the block and replaced'in reversed positions rotated 180 about their longitudinal axes'to the'position of Fig. 5, and-the bolts are replaced as illustrated in Fig. 5 with the long bolts 51 pivotallysecuring the links 50 in the outer perforations of the block. Whenthe links are thus connected, rearward thrust of" the block thereon in the pullingoperation forces the elements' inwardly against the bushings on the bolts 56- whic'h serve aspi-votal'abutments for the elements and cause the jaws 48 to move outwardly and'ti'ghtly engage and hold the workfin without danger of displacement therefrom. -It will be understood that the bushings can be elim- Two relatively long.

This tool com:

4 inated if desired and the elements 45 pivoted directly against the bolts.

The form of invention illustrated in Figs. 4-6 is more particularly adapted to use on large and heavy work and, while springs can be employed for moving the elements laterally in the manner described in connection with Figs. 1-3, such springs are ordinarily not required or desirable in the larger and reversible pullers of my invention. 7

Having thus described and illustrated my invention what I claim as new and desire to secure by Letters Patent of the United States is:

A pulling tool comprising a block having a threaded bore, a power screw threaded through the bore and-having a work engaging end forq wardly of the block, a plurality of relatively long elements disposed on opposite sides of and extending longitudinally of the screw from a position rearwardly of the. block to a position forwardlyithereofand having work engaging jaws on their forward ends, aplurality of links; each link'being pivotally attached to an element rearwardly of the block and extending forwardly therefrom andpivotally attached at its forward end to the block at one side of the element, a plurahty of extensions carried by the block, each extension projecting toward an element and being provided with a slot for the free pivotal and sliding movement of the element therein, and an abutment associated with each extension at the side of said slot to be engaged by an intermediate portion of each element to limit lateral movement thereof radially of the screw; rearward pulling pressure of the screw on the block being adapted to function through thelinks to force the elements toward and against the abutments' which thereupon serve as fulcrums for the elements.

ARTHUR L. CORNWELL.

REFERENCES CITED The following references are of'record'in the file of this patent:

V UNITED STATES PATENTS Number 228,452 GreatBrit'ain -Feb.; 5,- I925 

